Lead is an element, number 82 on the periodic table.

Decayed lead points on an impulse pack
Old 23rd century type impulse packs (part of the impulse engines) were insulated with an element that could decay to lead. When a ship had been through trauma it was best to check the points of the packs, because if they had decayed, when activated they could take out the entire impulse deck.
After encountering the galactic barrier, Lee Kelso checked the impulse engines and did not notice that the damaged points on the impulse pack had "about decayed to lead." (TOS: "Where No Man Has Gone Before")
The surface temperature of the innermost planet of system L-374, of the two planets that survived the planet killer's attack, was that of molten lead. (TOS: "The Doomsday Machine")
Crewman Henley remarked that her legs felt "like lead pipes" even before Tuvok made her and other Maquis members of the USS Voyager crew run ten kilometers. (VOY: "Learning Curve")
External links
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- Lead at Memory Beta, the wiki for licensed Star Trek works
- Lead at Wikipedia